[stubs] Improve code generation for ToBoolean.

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index e1f0f18c0a555fcc127c507cfc29635ad67fbcfd..5f802235afa11138c8f135465f79f6244667e10d 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -133,7 +133,6 @@ namespace internal {
   V(StringLessThanOrEqual)                  \
   V(StringGreaterThan)                      \
   V(StringGreaterThanOrEqual)               \
-  V(ToBoolean)                              \
   V(ToInteger)                              \
   V(ToLength)                               \
   V(HasProperty)                            \
@@ -933,14 +932,6 @@ class StringGreaterThanOrEqualStub final : public TurboFanCodeStub {
   DEFINE_TURBOFAN_CODE_STUB(StringGreaterThanOrEqual, TurboFanCodeStub);
 };
 
-class ToBooleanStub final : public TurboFanCodeStub {
- public:
-  explicit ToBooleanStub(Isolate* isolate) : TurboFanCodeStub(isolate) {}
-
-  DEFINE_CALL_INTERFACE_DESCRIPTOR(TypeConversion);
-  DEFINE_TURBOFAN_UNARY_OP_CODE_STUB(ToBoolean, TurboFanCodeStub);
-};
-
 class ToIntegerStub final : public TurboFanCodeStub {
  public:
   explicit ToIntegerStub(Isolate* isolate) : TurboFanCodeStub(isolate) {}